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自组织模糊控制能馈电子负载模拟策略

1731    2020-03-14

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作者:林壮彬, 薛家祥

作者单位:华南理工大学机械与汽车工程学院,广东 广州 510640


关键词:负载模拟;移相全桥;自组织模糊控制;小信号模型


摘要:

针对电子负载对响应快,控制准的测试性能需要,提出基于移相全桥隔离型拓扑的负载模拟电路,设计基于LEM传感器和LF353M的比例运算信号调理电路,并提出自组织型模糊控制的电流PI单闭环策略。对功率传递下的移相全桥电路作小信号等效电路模型并推理出输入电流与控制移相角的传递函数,并结合相位裕度稳定法设计PI校正器。最后,设计并通过自组织变论域改进模糊控制器,从而串联PI校正器进行参数智能调整。通过仿真验证和实验表明,在7 A的输入电流工况下,自组织模糊控制PI策略实现在7 ms内到达稳态,且稳态误差在3%以内,相比于常规PI与常规模糊控制,具有更良好的动态响应和稳态性能。


Self-organizing fuzzy control strategy for energy feed electronic load
LIN Zhuangbin, XUE Jiaxiang
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
Abstract: To meet the requirement of fast response and high accuracy of electronic load, load simulation circuit based on the phase-shifted full-bridge isolation topology is proposed. LEM sensor and LF353M are used to design the proportional computation signal conditioning circuit. On this basis, a single closed-loop feedback strategy of PI current control with self-organizing fuzzy control is proposed. In the paper, the small-signal model of phase-shifted full-bridge circuit is established, so as to calculate the transfer function of the input current and phase-shifted angle during the period of transferring power. Besides, the PI corrector is designed in the method of phase margin stabilization. Finally, the fuzzy controller is designed and improved through the self-organizing variable theory domain, so that the PI corrector can be adjusted intelligently. The simulation and experiment results show that the self-organizing fuzzy control PI strategy is capable of achieving steady-state within 7 ms when input current is set as 7 A, with the steady-state error of less than 3%. Compared with conventional PI and conventional fuzzy control, it has better dynamic response and steady-state performances.
Keywords: load simulation;phase-shifted full bridge;self-organizing fuzzy control;small-signal model
2020, 46(3):115-122  收稿日期: 2019-03-12;收到修改稿日期: 2019-05-10
基金项目: 福建省自然科学基金项目(2018J01541);广东省交通厅科技项目(科技-2017-02-041);2015东莞市引进第三批创新科研团队项目(2017360004004);广州市南沙区科技计划项目(2016CX010,2017CX009)
作者简介: 林壮彬(1995-),男,广东汕头市人,硕士研究生,专业方向为仪器仪表工程
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